And do you truly know the source of the material?

Read more: What’s the Difference between 106 and 1067 Glass?

Bill Hargin

The stack-up and materials are the backbone of a board design.

Read more: Material Selection for High-Speed PCB Design, Part 1

Bill HarginPart three of our series on Dk and Df characterization looks at stripline methods.

This is part three in a series that examines how the industry at-large characterizes laminates. It’s true such things are of little interest below 1GHz, but I suspect the relative comfort of the sub-GHz world has slipped into the distant past for many of us.

Part I summarized the “anarchy” that permeates this part of the PCB design world. Part II, last month’s column, pointed out a dozen different “standards” can be used to characterize Dk and Df. In fact, there’s little evidence to suggest the standardization process has led the industry to true standards. To me, “standard” means that if I measure something in Taipei, Tokyo, Toulouse or Toronto, I’m going to get pretty close to the same result if I follow a “standard” test method. That’s not what we have. Here in Part III, we’ll focus primarily on the electric-field (E-field) orientation of the measurement equipment.

Read more: Laminate Characterization Measurement Testing

The background of the measurement specs and tests.

Read more: Dk and Df Characterization Methods for PCB Laminates – Part II
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